[PATCH] uml: hot-unplug code cleanup
[linux-2.6.git] / arch / um / drivers / net_kern.c
1 /*
2  * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and 
3  * James Leu (jleu@mindspring.net).
4  * Copyright (C) 2001 by various other people who didn't put their name here.
5  * Licensed under the GPL.
6  */
7
8 #include "linux/config.h"
9 #include "linux/kernel.h"
10 #include "linux/netdevice.h"
11 #include "linux/rtnetlink.h"
12 #include "linux/skbuff.h"
13 #include "linux/socket.h"
14 #include "linux/spinlock.h"
15 #include "linux/module.h"
16 #include "linux/init.h"
17 #include "linux/etherdevice.h"
18 #include "linux/list.h"
19 #include "linux/inetdevice.h"
20 #include "linux/ctype.h"
21 #include "linux/bootmem.h"
22 #include "linux/ethtool.h"
23 #include "asm/uaccess.h"
24 #include "user_util.h"
25 #include "kern_util.h"
26 #include "net_kern.h"
27 #include "net_user.h"
28 #include "mconsole_kern.h"
29 #include "init.h"
30 #include "irq_user.h"
31 #include "irq_kern.h"
32
33 #define DRIVER_NAME "uml-netdev"
34
35 static DEFINE_SPINLOCK(opened_lock);
36 LIST_HEAD(opened);
37
38 static int uml_net_rx(struct net_device *dev)
39 {
40         struct uml_net_private *lp = dev->priv;
41         int pkt_len;
42         struct sk_buff *skb;
43
44         /* If we can't allocate memory, try again next round. */
45         skb = dev_alloc_skb(dev->mtu);
46         if (skb == NULL) {
47                 lp->stats.rx_dropped++;
48                 return 0;
49         }
50
51         skb->dev = dev;
52         skb_put(skb, dev->mtu);
53         skb->mac.raw = skb->data;
54         pkt_len = (*lp->read)(lp->fd, &skb, lp);
55
56         if (pkt_len > 0) {
57                 skb_trim(skb, pkt_len);
58                 skb->protocol = (*lp->protocol)(skb);
59                 netif_rx(skb);
60
61                 lp->stats.rx_bytes += skb->len;
62                 lp->stats.rx_packets++;
63                 return pkt_len;
64         }
65
66         kfree_skb(skb);
67         return pkt_len;
68 }
69
70 irqreturn_t uml_net_interrupt(int irq, void *dev_id, struct pt_regs *regs)
71 {
72         struct net_device *dev = dev_id;
73         struct uml_net_private *lp = dev->priv;
74         int err;
75
76         if(!netif_running(dev))
77                 return(IRQ_NONE);
78
79         spin_lock(&lp->lock);
80         while((err = uml_net_rx(dev)) > 0) ;
81         if(err < 0) {
82                 printk(KERN_ERR 
83                        "Device '%s' read returned %d, shutting it down\n", 
84                        dev->name, err);
85                 dev_close(dev);
86                 goto out;
87         }
88         reactivate_fd(lp->fd, UM_ETH_IRQ);
89
90  out:
91         spin_unlock(&lp->lock);
92         return(IRQ_HANDLED);
93 }
94
95 static int uml_net_open(struct net_device *dev)
96 {
97         struct uml_net_private *lp = dev->priv;
98         char addr[sizeof("255.255.255.255\0")];
99         int err;
100
101         spin_lock(&lp->lock);
102
103         if(lp->fd >= 0){
104                 err = -ENXIO;
105                 goto out;
106         }
107
108         if(!lp->have_mac){
109                 dev_ip_addr(dev, addr, &lp->mac[2]);
110                 set_ether_mac(dev, lp->mac);
111         }
112
113         lp->fd = (*lp->open)(&lp->user);
114         if(lp->fd < 0){
115                 err = lp->fd;
116                 goto out;
117         }
118
119         err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,
120                              SA_INTERRUPT | SA_SHIRQ, dev->name, dev);
121         if(err != 0){
122                 printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
123                 if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
124                 lp->fd = -1;
125                 err = -ENETUNREACH;
126         }
127
128         lp->tl.data = (unsigned long) &lp->user;
129         netif_start_queue(dev);
130
131         /* clear buffer - it can happen that the host side of the interface
132          * is full when we get here.  In this case, new data is never queued,
133          * SIGIOs never arrive, and the net never works.
134          */
135         while((err = uml_net_rx(dev)) > 0) ;
136
137  out:
138         spin_unlock(&lp->lock);
139         return(err);
140 }
141
142 static int uml_net_close(struct net_device *dev)
143 {
144         struct uml_net_private *lp = dev->priv;
145         
146         netif_stop_queue(dev);
147         spin_lock(&lp->lock);
148
149         free_irq(dev->irq, dev);
150         if(lp->close != NULL)
151                 (*lp->close)(lp->fd, &lp->user);
152         lp->fd = -1;
153
154         spin_unlock(&lp->lock);
155         return 0;
156 }
157
158 static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
159 {
160         struct uml_net_private *lp = dev->priv;
161         unsigned long flags;
162         int len;
163
164         netif_stop_queue(dev);
165
166         spin_lock_irqsave(&lp->lock, flags);
167
168         len = (*lp->write)(lp->fd, &skb, lp);
169
170         if(len == skb->len) {
171                 lp->stats.tx_packets++;
172                 lp->stats.tx_bytes += skb->len;
173                 dev->trans_start = jiffies;
174                 netif_start_queue(dev);
175
176                 /* this is normally done in the interrupt when tx finishes */
177                 netif_wake_queue(dev);
178         } 
179         else if(len == 0){
180                 netif_start_queue(dev);
181                 lp->stats.tx_dropped++;
182         }
183         else {
184                 netif_start_queue(dev);
185                 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
186         }
187
188         spin_unlock_irqrestore(&lp->lock, flags);
189
190         dev_kfree_skb(skb);
191
192         return 0;
193 }
194
195 static struct net_device_stats *uml_net_get_stats(struct net_device *dev)
196 {
197         struct uml_net_private *lp = dev->priv;
198         return &lp->stats;
199 }
200
201 static void uml_net_set_multicast_list(struct net_device *dev)
202 {
203         if (dev->flags & IFF_PROMISC) return;
204         else if (dev->mc_count) dev->flags |= IFF_ALLMULTI;
205         else dev->flags &= ~IFF_ALLMULTI;
206 }
207
208 static void uml_net_tx_timeout(struct net_device *dev)
209 {
210         dev->trans_start = jiffies;
211         netif_wake_queue(dev);
212 }
213
214 static int uml_net_set_mac(struct net_device *dev, void *addr)
215 {
216         struct uml_net_private *lp = dev->priv;
217         struct sockaddr *hwaddr = addr;
218
219         spin_lock(&lp->lock);
220         memcpy(dev->dev_addr, hwaddr->sa_data, ETH_ALEN);
221         spin_unlock(&lp->lock);
222
223         return(0);
224 }
225
226 static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
227 {
228         struct uml_net_private *lp = dev->priv;
229         int err = 0;
230
231         spin_lock(&lp->lock);
232
233         new_mtu = (*lp->set_mtu)(new_mtu, &lp->user);
234         if(new_mtu < 0){
235                 err = new_mtu;
236                 goto out;
237         }
238
239         dev->mtu = new_mtu;
240
241  out:
242         spin_unlock(&lp->lock);
243         return err;
244 }
245
246 static int uml_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
247 {
248         static const struct ethtool_drvinfo info = {
249                 .cmd     = ETHTOOL_GDRVINFO,
250                 .driver  = DRIVER_NAME,
251                 .version = "42",
252         };
253         void *useraddr;
254         u32 ethcmd;
255
256         switch (cmd) {
257         case SIOCETHTOOL:
258                 useraddr = ifr->ifr_data;
259                 if (copy_from_user(&ethcmd, useraddr, sizeof(ethcmd)))
260                         return -EFAULT;
261                 switch (ethcmd) {
262                 case ETHTOOL_GDRVINFO:
263                         if (copy_to_user(useraddr, &info, sizeof(info)))
264                                 return -EFAULT;
265                         return 0;
266                 default:
267                         return -EOPNOTSUPP;
268                 }
269         default:
270                 return -EINVAL;
271         }
272 }
273
274 void uml_net_user_timer_expire(unsigned long _conn)
275 {
276 #ifdef undef
277         struct connection *conn = (struct connection *)_conn;
278
279         dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
280         do_connect(conn);
281 #endif
282 }
283
284 static DEFINE_SPINLOCK(devices_lock);
285 static struct list_head devices = LIST_HEAD_INIT(devices);
286
287 static struct device_driver uml_net_driver = {
288         .name  = DRIVER_NAME,
289         .bus   = &platform_bus_type,
290 };
291 static int driver_registered;
292
293 static int eth_configure(int n, void *init, char *mac,
294                          struct transport *transport)
295 {
296         struct uml_net *device;
297         struct net_device *dev;
298         struct uml_net_private *lp;
299         int save, err, size;
300
301         size = transport->private_size + sizeof(struct uml_net_private) + 
302                 sizeof(((struct uml_net_private *) 0)->user);
303
304         device = kmalloc(sizeof(*device), GFP_KERNEL);
305         if (device == NULL) {
306                 printk(KERN_ERR "eth_configure failed to allocate uml_net\n");
307                 return(1);
308         }
309
310         memset(device, 0, sizeof(*device));
311         INIT_LIST_HEAD(&device->list);
312         device->index = n;
313
314         spin_lock(&devices_lock);
315         list_add(&device->list, &devices);
316         spin_unlock(&devices_lock);
317
318         if (setup_etheraddr(mac, device->mac))
319                 device->have_mac = 1;
320
321         printk(KERN_INFO "Netdevice %d ", n);
322         if (device->have_mac)
323                 printk("(%02x:%02x:%02x:%02x:%02x:%02x) ",
324                        device->mac[0], device->mac[1],
325                        device->mac[2], device->mac[3],
326                        device->mac[4], device->mac[5]);
327         printk(": ");
328         dev = alloc_etherdev(size);
329         if (dev == NULL) {
330                 printk(KERN_ERR "eth_configure: failed to allocate device\n");
331                 return 1;
332         }
333
334         /* sysfs register */
335         if (!driver_registered) {
336                 driver_register(&uml_net_driver);
337                 driver_registered = 1;
338         }
339         device->pdev.id = n;
340         device->pdev.name = DRIVER_NAME;
341         platform_device_register(&device->pdev);
342         SET_NETDEV_DEV(dev,&device->pdev.dev);
343
344         /* If this name ends up conflicting with an existing registered
345          * netdevice, that is OK, register_netdev{,ice}() will notice this
346          * and fail.
347          */
348         snprintf(dev->name, sizeof(dev->name), "eth%d", n);
349         device->dev = dev;
350
351         (*transport->kern->init)(dev, init);
352
353         dev->mtu = transport->user->max_packet;
354         dev->open = uml_net_open;
355         dev->hard_start_xmit = uml_net_start_xmit;
356         dev->stop = uml_net_close;
357         dev->get_stats = uml_net_get_stats;
358         dev->set_multicast_list = uml_net_set_multicast_list;
359         dev->tx_timeout = uml_net_tx_timeout;
360         dev->set_mac_address = uml_net_set_mac;
361         dev->change_mtu = uml_net_change_mtu;
362         dev->do_ioctl = uml_net_ioctl;
363         dev->watchdog_timeo = (HZ >> 1);
364         dev->irq = UM_ETH_IRQ;
365
366         rtnl_lock();
367         err = register_netdevice(dev);
368         rtnl_unlock();
369         if (err) {
370                 device->dev = NULL;
371                 /* XXX: should we call ->remove() here? */
372                 free_netdev(dev);
373                 return 1;
374         }
375         lp = dev->priv;
376
377         /* lp.user is the first four bytes of the transport data, which
378          * has already been initialized.  This structure assignment will
379          * overwrite that, so we make sure that .user gets overwritten with
380          * what it already has.
381          */
382         save = lp->user[0];
383         *lp = ((struct uml_net_private)
384                 { .list                 = LIST_HEAD_INIT(lp->list),
385                   .dev                  = dev,
386                   .fd                   = -1,
387                   .mac                  = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
388                   .have_mac             = device->have_mac,
389                   .protocol             = transport->kern->protocol,
390                   .open                 = transport->user->open,
391                   .close                = transport->user->close,
392                   .remove               = transport->user->remove,
393                   .read                 = transport->kern->read,
394                   .write                = transport->kern->write,
395                   .add_address          = transport->user->add_address,
396                   .delete_address       = transport->user->delete_address,
397                   .set_mtu              = transport->user->set_mtu,
398                   .user                 = { save } });
399
400         init_timer(&lp->tl);
401         spin_lock_init(&lp->lock);
402         lp->tl.function = uml_net_user_timer_expire;
403         if (lp->have_mac)
404                 memcpy(lp->mac, device->mac, sizeof(lp->mac));
405
406         if (transport->user->init) 
407                 (*transport->user->init)(&lp->user, dev);
408
409         if (device->have_mac)
410                 set_ether_mac(dev, device->mac);
411
412         spin_lock(&opened_lock);
413         list_add(&lp->list, &opened);
414         spin_unlock(&opened_lock);
415
416         return(0);
417 }
418
419 static struct uml_net *find_device(int n)
420 {
421         struct uml_net *device;
422         struct list_head *ele;
423
424         spin_lock(&devices_lock);
425         list_for_each(ele, &devices){
426                 device = list_entry(ele, struct uml_net, list);
427                 if(device->index == n)
428                         goto out;
429         }
430         device = NULL;
431  out:
432         spin_unlock(&devices_lock);
433         return(device);
434 }
435
436 static int eth_parse(char *str, int *index_out, char **str_out)
437 {
438         char *end;
439         int n;
440
441         n = simple_strtoul(str, &end, 0);
442         if(end == str){
443                 printk(KERN_ERR "eth_setup: Failed to parse '%s'\n", str);
444                 return(1);
445         }
446         if(n < 0){
447                 printk(KERN_ERR "eth_setup: device %d is negative\n", n);
448                 return(1);
449         }
450         str = end;
451         if(*str != '='){
452                 printk(KERN_ERR 
453                        "eth_setup: expected '=' after device number\n");
454                 return(1);
455         }
456         str++;
457         if(find_device(n)){
458                 printk(KERN_ERR "eth_setup: Device %d already configured\n",
459                        n);
460                 return(1);
461         }
462         if(index_out) *index_out = n;
463         *str_out = str;
464         return(0);
465 }
466
467 struct eth_init {
468         struct list_head list;
469         char *init;
470         int index;
471 };
472
473 /* Filled in at boot time.  Will need locking if the transports become
474  * modular.
475  */
476 struct list_head transports = LIST_HEAD_INIT(transports);
477
478 /* Filled in during early boot */
479 struct list_head eth_cmd_line = LIST_HEAD_INIT(eth_cmd_line);
480
481 static int check_transport(struct transport *transport, char *eth, int n,
482                            void **init_out, char **mac_out)
483 {
484         int len;
485
486         len = strlen(transport->name);
487         if(strncmp(eth, transport->name, len))
488                 return(0);
489
490         eth += len;
491         if(*eth == ',')
492                 eth++;
493         else if(*eth != '\0')
494                 return(0);
495
496         *init_out = kmalloc(transport->setup_size, GFP_KERNEL);
497         if(*init_out == NULL)
498                 return(1);
499
500         if(!transport->setup(eth, mac_out, *init_out)){
501                 kfree(*init_out);
502                 *init_out = NULL;
503         }
504         return(1);
505 }
506
507 void register_transport(struct transport *new)
508 {
509         struct list_head *ele, *next;
510         struct eth_init *eth;
511         void *init;
512         char *mac = NULL;
513         int match;
514
515         list_add(&new->list, &transports);
516
517         list_for_each_safe(ele, next, &eth_cmd_line){
518                 eth = list_entry(ele, struct eth_init, list);
519                 match = check_transport(new, eth->init, eth->index, &init,
520                                         &mac);
521                 if(!match)
522                         continue;
523                 else if(init != NULL){
524                         eth_configure(eth->index, init, mac, new);
525                         kfree(init);
526                 }
527                 list_del(&eth->list);
528         }
529 }
530
531 static int eth_setup_common(char *str, int index)
532 {
533         struct list_head *ele;
534         struct transport *transport;
535         void *init;
536         char *mac = NULL;
537
538         list_for_each(ele, &transports){
539                 transport = list_entry(ele, struct transport, list);
540                 if(!check_transport(transport, str, index, &init, &mac))
541                         continue;
542                 if(init != NULL){
543                         eth_configure(index, init, mac, transport);
544                         kfree(init);
545                 }
546                 return(1);
547         }
548         return(0);
549 }
550
551 static int eth_setup(char *str)
552 {
553         struct eth_init *new;
554         int n, err;
555
556         err = eth_parse(str, &n, &str);
557         if(err) return(1);
558
559         new = alloc_bootmem(sizeof(new));
560         if (new == NULL){
561                 printk("eth_init : alloc_bootmem failed\n");
562                 return(1);
563         }
564
565         INIT_LIST_HEAD(&new->list);
566         new->index = n;
567         new->init = str;
568
569         list_add_tail(&new->list, &eth_cmd_line);
570         return(1);
571 }
572
573 __setup("eth", eth_setup);
574 __uml_help(eth_setup,
575 "eth[0-9]+=<transport>,<options>\n"
576 "    Configure a network device.\n\n"
577 );
578
579 #if 0
580 static int eth_init(void)
581 {
582         struct list_head *ele, *next;
583         struct eth_init *eth;
584
585         list_for_each_safe(ele, next, &eth_cmd_line){
586                 eth = list_entry(ele, struct eth_init, list);
587
588                 if(eth_setup_common(eth->init, eth->index))
589                         list_del(&eth->list);
590         }
591         
592         return(1);
593 }
594 __initcall(eth_init);
595 #endif
596
597 static int net_config(char *str)
598 {
599         int n, err;
600
601         err = eth_parse(str, &n, &str);
602         if(err) return(err);
603
604         str = uml_strdup(str);
605         if(str == NULL){
606                 printk(KERN_ERR "net_config failed to strdup string\n");
607                 return(-1);
608         }
609         err = !eth_setup_common(str, n);
610         if(err) 
611                 kfree(str);
612         return(err);
613 }
614
615 static int net_id(char **str, int *start_out, int *end_out)
616 {
617         char *end;
618         int n;
619
620         n = simple_strtoul(*str, &end, 0);
621         if((*end != '\0') || (end == *str))
622                 return -1;
623
624         *start_out = n;
625         *end_out = n;
626         *str = end;
627         return n;
628 }
629
630 static int net_remove(int n)
631 {
632         struct uml_net *device;
633         struct net_device *dev;
634         struct uml_net_private *lp;
635
636         device = find_device(n);
637         if(device == NULL)
638                 return -ENODEV;
639
640         dev = device->dev;
641         lp = dev->priv;
642         if(lp->fd > 0)
643                 return -EBUSY;
644         if(lp->remove != NULL) (*lp->remove)(&lp->user);
645         unregister_netdev(dev);
646         platform_device_unregister(&device->pdev);
647
648         list_del(&device->list);
649         kfree(device);
650         free_netdev(dev);
651         return 0;
652 }
653
654 static struct mc_device net_mc = {
655         .name           = "eth",
656         .config         = net_config,
657         .get_config     = NULL,
658         .id             = net_id,
659         .remove         = net_remove,
660 };
661
662 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
663                               void *ptr)
664 {
665         struct in_ifaddr *ifa = ptr;
666         u32 addr = ifa->ifa_address;
667         u32 netmask = ifa->ifa_mask;
668         struct net_device *dev = ifa->ifa_dev->dev;
669         struct uml_net_private *lp;
670         void (*proc)(unsigned char *, unsigned char *, void *);
671         unsigned char addr_buf[4], netmask_buf[4];
672
673         if(dev->open != uml_net_open) return(NOTIFY_DONE);
674
675         lp = dev->priv;
676
677         proc = NULL;
678         switch (event){
679         case NETDEV_UP:
680                 proc = lp->add_address;
681                 break;
682         case NETDEV_DOWN:
683                 proc = lp->delete_address;
684                 break;
685         }
686         if(proc != NULL){
687                 addr_buf[0] = addr & 0xff;
688                 addr_buf[1] = (addr >> 8) & 0xff;
689                 addr_buf[2] = (addr >> 16) & 0xff;
690                 addr_buf[3] = addr >> 24;
691                 netmask_buf[0] = netmask & 0xff;
692                 netmask_buf[1] = (netmask >> 8) & 0xff;
693                 netmask_buf[2] = (netmask >> 16) & 0xff;
694                 netmask_buf[3] = netmask >> 24;
695                 (*proc)(addr_buf, netmask_buf, &lp->user);
696         }
697         return(NOTIFY_DONE);
698 }
699
700 struct notifier_block uml_inetaddr_notifier = {
701         .notifier_call          = uml_inetaddr_event,
702 };
703
704 static int uml_net_init(void)
705 {
706         struct list_head *ele;
707         struct uml_net_private *lp;     
708         struct in_device *ip;
709         struct in_ifaddr *in;
710
711         mconsole_register_dev(&net_mc);
712         register_inetaddr_notifier(&uml_inetaddr_notifier);
713
714         /* Devices may have been opened already, so the uml_inetaddr_notifier
715          * didn't get a chance to run for them.  This fakes it so that
716          * addresses which have already been set up get handled properly.
717          */
718         list_for_each(ele, &opened){
719                 lp = list_entry(ele, struct uml_net_private, list);
720                 ip = lp->dev->ip_ptr;
721                 if(ip == NULL) continue;
722                 in = ip->ifa_list;
723                 while(in != NULL){
724                         uml_inetaddr_event(NULL, NETDEV_UP, in);
725                         in = in->ifa_next;
726                 }
727         }       
728
729         return(0);
730 }
731
732 __initcall(uml_net_init);
733
734 static void close_devices(void)
735 {
736         struct list_head *ele;
737         struct uml_net_private *lp;
738
739         list_for_each(ele, &opened){
740                 lp = list_entry(ele, struct uml_net_private, list);
741                 if((lp->close != NULL) && (lp->fd >= 0))
742                         (*lp->close)(lp->fd, &lp->user);
743                 if(lp->remove != NULL) (*lp->remove)(&lp->user);
744         }
745 }
746
747 __uml_exitcall(close_devices);
748
749 int setup_etheraddr(char *str, unsigned char *addr)
750 {
751         char *end;
752         int i;
753
754         if(str == NULL)
755                 return(0);
756         for(i=0;i<6;i++){
757                 addr[i] = simple_strtoul(str, &end, 16);
758                 if((end == str) ||
759                    ((*end != ':') && (*end != ',') && (*end != '\0'))){
760                         printk(KERN_ERR 
761                                "setup_etheraddr: failed to parse '%s' "
762                                "as an ethernet address\n", str);
763                         return(0);
764                 }
765                 str = end + 1;
766         }
767         if(addr[0] & 1){
768                 printk(KERN_ERR 
769                        "Attempt to assign a broadcast ethernet address to a "
770                        "device disallowed\n");
771                 return(0);
772         }
773         return(1);
774 }
775
776 void dev_ip_addr(void *d, char *buf, char *bin_buf)
777 {
778         struct net_device *dev = d;
779         struct in_device *ip = dev->ip_ptr;
780         struct in_ifaddr *in;
781         u32 addr;
782
783         if((ip == NULL) || ((in = ip->ifa_list) == NULL)){
784                 printk(KERN_WARNING "dev_ip_addr - device not assigned an "
785                        "IP address\n");
786                 return;
787         }
788         addr = in->ifa_address;
789         sprintf(buf, "%d.%d.%d.%d", addr & 0xff, (addr >> 8) & 0xff, 
790                 (addr >> 16) & 0xff, addr >> 24);
791         if(bin_buf){
792                 bin_buf[0] = addr & 0xff;
793                 bin_buf[1] = (addr >> 8) & 0xff;
794                 bin_buf[2] = (addr >> 16) & 0xff;
795                 bin_buf[3] = addr >> 24;
796         }
797 }
798
799 void set_ether_mac(void *d, unsigned char *addr)
800 {
801         struct net_device *dev = d;
802
803         memcpy(dev->dev_addr, addr, ETH_ALEN);  
804 }
805
806 struct sk_buff *ether_adjust_skb(struct sk_buff *skb, int extra)
807 {
808         if((skb != NULL) && (skb_tailroom(skb) < extra)){
809                 struct sk_buff *skb2;
810
811                 skb2 = skb_copy_expand(skb, 0, extra, GFP_ATOMIC);
812                 dev_kfree_skb(skb);
813                 skb = skb2;
814         }
815         if(skb != NULL) skb_put(skb, extra);
816         return(skb);
817 }
818
819 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *, 
820                                         void *), 
821                     void *arg)
822 {
823         struct net_device *dev = d;
824         struct in_device *ip = dev->ip_ptr;
825         struct in_ifaddr *in;
826         unsigned char address[4], netmask[4];
827
828         if(ip == NULL) return;
829         in = ip->ifa_list;
830         while(in != NULL){
831                 address[0] = in->ifa_address & 0xff;
832                 address[1] = (in->ifa_address >> 8) & 0xff;
833                 address[2] = (in->ifa_address >> 16) & 0xff;
834                 address[3] = in->ifa_address >> 24;
835                 netmask[0] = in->ifa_mask & 0xff;
836                 netmask[1] = (in->ifa_mask >> 8) & 0xff;
837                 netmask[2] = (in->ifa_mask >> 16) & 0xff;
838                 netmask[3] = in->ifa_mask >> 24;
839                 (*cb)(address, netmask, arg);
840                 in = in->ifa_next;
841         }
842 }
843
844 int dev_netmask(void *d, void *m)
845 {
846         struct net_device *dev = d;
847         struct in_device *ip = dev->ip_ptr;
848         struct in_ifaddr *in;
849         __u32 *mask_out = m;
850
851         if(ip == NULL) 
852                 return(1);
853
854         in = ip->ifa_list;
855         if(in == NULL) 
856                 return(1);
857
858         *mask_out = in->ifa_mask;
859         return(0);
860 }
861
862 void *get_output_buffer(int *len_out)
863 {
864         void *ret;
865
866         ret = (void *) __get_free_pages(GFP_KERNEL, 0);
867         if(ret) *len_out = PAGE_SIZE;
868         else *len_out = 0;
869         return(ret);
870 }
871
872 void free_output_buffer(void *buffer)
873 {
874         free_pages((unsigned long) buffer, 0);
875 }
876
877 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out, 
878                      char **gate_addr)
879 {
880         char *remain;
881
882         remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
883         if(remain != NULL){
884                 printk("tap_setup_common - Extra garbage on specification : "
885                        "'%s'\n", remain);
886                 return(1);
887         }
888
889         return(0);
890 }
891
892 unsigned short eth_protocol(struct sk_buff *skb)
893 {
894         return(eth_type_trans(skb, skb->dev));
895 }
896
897 /*
898  * Overrides for Emacs so that we follow Linus's tabbing style.
899  * Emacs will notice this stuff at the end of the file and automatically
900  * adjust the settings for this buffer only.  This must remain at the end
901  * of the file.
902  * ---------------------------------------------------------------------------
903  * Local variables:
904  * c-file-style: "linux"
905  * End:
906  */